Find a Potential for the Given Vector Field $$\vec { F } ( x , y ) = \left\langle - e ^ { y } \sin \left( x e ^ { y } \right) , - x e ^ { y } \sin \left( x e ^ { y } \right) \right\rangle$$

Find a potential for the given vector field: $$\vec { F } ( x , y ) = \left\langle - e ^ { y } \sin \left( x e ^ { y } \right) , - x e ^ { y } \sin \left( x e ^ { y } \right) \right\rangle$$